The settings of the interlinearizer can be confusing - I usually have to look at them several times. From the screenshot it looks like you have chosen the option to Create based on a model text. When you choose this option there is a note under the output text box that says "Output glosses to a standard, daughter or auxilary project". Note that back translations will not show up in this list. If you want to output to your back translation, you should choose the option to create a back translation.